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NEW QUESTION: 1

A. Option B
B. Option C
C. Option D
D. Option A
E. Option E
Answer: E

NEW QUESTION: 2
次のシナリオでは、学習者全員が出口評価で良好なスコアを獲得しました。しかし、職場に戻ると、学習者は学習したプロセスを使用できませんでした。次のBESTのどれが情報転送を表しますか？
A. 問題解決トレーニングの成功
B. 管理サポートが不十分
C. 方法ではなく、理由を教える
D. 仮想的な状況での想起
Answer: C

NEW QUESTION: 3
To ensure confidentiality through the use of asymmetric encryption, a message is encrypted with which of the following?
A. Sender's private key
B. Recipient's public key
C. Sender's public key
D. Recipient's private key
Answer: D

NEW QUESTION: 4
ソリューションアーキテクトは、プライマリウェブサイトが利用できない場合にユーザーがバックアップの静的エラーページにリダイレクトするソリューションを設計しています。プライマリウェブサイトのDNSレコードは、ドメインがApplication Load Balancer（ALB）を指しているAmazon Route 53でホストされています。ソリューションアーキテクトは、変更とインフラストラクチャのオーバーヘッドを最小限に抑えながら、会社のニーズを満たすために使用する必要がありますか？
A. Route 53のヘルス-パッシブフェイルオーバー構成をセットアップします。Route53ヘルスチェックでALBエンドポイントが異常であると判断した場合、Amazon S3バケット内でホストされている静的エラーページにトラフィックを転送します
B. エンドポイントRoute 53がインスタンスにリクエストを送信するのは、ALBのヘルスチェックが失敗した場合のみ、ALBと静的エラーページをホストするAmazon EC2インスタンスを使用してRoute 53アクティブ/アクティブ構成をセットアップします。
C. ルート53エイリアスレコードがALBを起点の1つとしてAmazon CloudFrontディストリビューションをポイントする次に、ディストリビューションのカスタムエラーページを作成します
D. Route 53レコードを更新して、遅延ベースのルーティングポリシーを使用するAmazon S3バケット内でホストされているバックアップ静的エラーページをレコードに追加して、トラフィックが最も応答性の高いエンドポイントに送信されるようにします
Answer: A
Explanation:
Explanation
Active-passive failover
Use an active-passive failover configuration when you want a primary resource or group of resources to be available the majority of the time and you want a secondary resource or group of resources to be on standby in case all the primary resources become unavailable. When responding to queries, Route 53 includes only the healthy primary resources. If all the primary resources are unhealthy, Route 53 begins to include only the healthy secondary resources in response to DNS queries.
To create an active-passive failover configuration with one primary record and one secondary record, you just create the records and specify Failover for the routing policy. When the primary resource is healthy, Route 53 responds to DNS queries using the primary record. When the primary resource is unhealthy, Route 53 responds to DNS queries using the secondary record.
How Amazon Route 53 averts cascading failures
As a first defense against cascading failures, each request routing algorithm (such as weighted and failover) has a mode of last resort. In this special mode, when all records are considered unhealthy, the Route 53 algorithm reverts to considering all records healthy.
For example, if all instances of an application, on several hosts, are rejecting health check requests, Route 53 DNS servers will choose an answer anyway and return it rather than returning no DNS answer or returning an NXDOMAIN (non-existent domain) response. An application can respond to users but still fail health checks, so this provides some protection against misconfiguration.
Similarly, if an application is overloaded, and one out of three endpoints fails its health checks, so that it's excluded from Route 53 DNS responses, Route 53 distributes responses between the two remaining endpoints.
If the remaining endpoints are unable to handle the additional load and they fail, Route 53 reverts to distributing requests to all three endpoints.
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover-types.html
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover-problems.html